Viewing archive of Saturday, 5 April 2025
Solar activity report
Report of Solar-Geophysical Activity 2025 Apr 05 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 95 Issued at 2200Z on 05 Apr 2025IA. Analysis of Solar Active Regions and Activity from 04-2100Z to 05-2100Z Solar activity has been at moderate levels for the past 24
hours. There are currently 10 numbered sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is likely to be moderate
with a slight chance for an X-class flare on days one, two, and three
(06 Apr, 07 Apr, 08 Apr).
IIA. Geophysical Activity Summary 04-2100Z to 05-2100Z
The geomagnetic
field has been at active to major storm levels for the past 24 hours.
Solar wind speed reached a peak of 589 km/s at 05/1801Z. Total IMF
reached 12 nT at 05/0206Z. The maximum southward component of Bz reached
-11 nT at 05/0150Z. Electrons greater than 2 MeV at geosynchronous
orbit reached a peak level of 2350 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to major storm levels on day one (06 Apr) and quiet to
active levels on days two and three (07 Apr, 08 Apr).
III. Event Probabilities 06 Apr to 08 Apr
| Class M | 60% | 60% | 55% |
| Class X | 15% | 10% | 10% |
| Proton | 05% | 05% | 05% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 05 Apr 184 Predicted 06 Apr-08 Apr 180/175/165 90 Day Mean 05 Apr 178
V. Geomagnetic A Indices
Observed Afr/Ap 04 Apr 019/033 Estimated Afr/Ap 05 Apr 032/044 Predicted Afr/Ap 06 Apr-08 Apr 017/004-010/004-011/004
VI. Geomagnetic Activity Probabilities 06 Apr to 08 Apr
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 35% | 30% | 30% |
| Minor storm | 20% | 15% | 15% |
| Major-severe storm | 05% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 10% | 15% | 15% |
| Minor storm | 30% | 30% | 30% |
| Major-severe storm | 50% | 45% | 45% |
All times in UTC
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Space weather facts
| Last X-flare | 2025/06/19 | X1.9 |
| Last M-flare | 2025/10/03 | M1.2 |
| Last geomagnetic storm | 2025/10/03 | Kp5 (G1) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| September 2025 | 129.8 -3.7 |
| October 2025 | 140.1 +10.3 |
| Last 30 days | 131.3 -1.2 |